我们知道,波段接收机的输入回路、高放回路和本振回路必须统一调谐。对于战术电台来说,接收机的调谐应该速度快、调谐准确并且调谐机构简便。在这方面,采用电调谐比采用手动调谐与机电调谐具有更多的优越性[1]。不过就电调谐而言,种类方案亦繁多。下面叙述一种我们提出并采用的电调谐方案。它的突出之点是,通用性强和电路简单。 We know that the band receiver input loop, high return and LO loops must be tuned in unison. For tactical radios, the receiver should be tuned fast, tuned accurately and the tuning mechanism is simple. In this regard, the use of electrical tuning than using manual tuning and electromechanical tuning has more advantages [1]. However, in terms of electrical tuning, the variety of programs is also numerous. Described below is an electrical tuning scheme that we have proposed and adopted. Its salient point is that versatility and circuit simplicity.